Car will not start. I have sprayed starting fluid into the throttle body and it will start for a second. Checked the fuel pump relay and seems fine. Trying to check for voltage at the pump when the key is on. There is no sound from the fuel pump when key is turned on.

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Is it carved or efi??If efi do this::locate your throttle body,pull the air intake hose loose from the throttle body,spray starting fluid or carb cleaner into the throttle body opening, push the hose back onto the throttle body then try to start the car.If it starts & runs for a few seconds then dies,you've got a No Fuel problem.If it doesn't start at all,you've got a No Spark problem.If its a no fuel issue,turn the key on & listen for the fuel pump priming sound.If you don't hear it,check for a blown fuel pump fuse,defective fuel pump relay,a defective computer power relay or a tripped inertia switch.If they're OK,disconnect the harness at the fuel pump,turn the key on and use a voltmeter to test for battery voltage.If voltage is present,the pump is bad.If voltage isn't present,but its present at the fuel pump relay harness, there's most likely a short/open in the wiring harness between the FP relay & pump.You didn't list your vehicle info,so I'm unsure of which type ignition you've got.
Most no starts on a new engine are caused by a ground wire you forgot to connect,wiring harness not plugged in or a timing issue.

You may want to try to see if the car will start while you spray starting fluid down the throttle body. If it doesn't, the problem may not be the fuel pump at all. There is an idle air control valve bolted to the front of the throttle body that can keep the car from starting as well.

If the car starts with the starting fluid, you might want to change your fuel filter. It's mounted under the car near the passenger rear door.

Good Evening, the first thing to check since you changed all the rest I would ask if you have checked fuel pressure. If you have not yet, just try spraying a little starting fluid into the throttle body once you remove the air cleaner. and if it starts there is a good chance your fuel pump went out, or the relay. Hope this points you in the right direction.

Spray some starting fluid into the throttle body. If the ignition system is working properly the car will start and run. While it's running spray more starting fluid into the throttle body little by little and see if you can keep it running. If it does run and stays running this way, your fuel pump is not working properly any more.